I totally agree w/ sepiroth, i've live of that one single move all my life. The hesitation move. I was never the quickest, most athletic player on the court. I have avg to below avg height. But hesitation moves allows me to get to the rim and either finish or get fouls. The thing with hesitation is, it makes your opponent off balance and when you bump them, you will usually get calls in your favor.

Regarding the floaters, try standing at around 5ft from the rim, then just keep on throwing 1 handers. Another drill is to put a chair and shoot 1 handers while sitting.